Friction-insert for braking-surfaces.



F. O. MILLER.

FRICTION INSERT FOR BRAKING SURFACES.

APPLICATION FILED DEC.4,1907.

Patented Mar. 9, 1909.

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FRICTIONJNSERT FGR BRAKING-SURFACE$ Specification of Letters Patent.

Patented March 9, 1909.

Application filed December 4, 1907. Serial No. 406,0d5.

To all whom it may concern:

Be it known that I, FREDERICK C. MILLER, a citizen of the United States, and residing at Cincinnati, in the county of Hamilton and State ofgOhio, have invented certain new and useful Improvements in Friction-Inserts for Bi'al:ingSui'faces, of which the following is a specification.

.The object of my invention is to provide a friction surface for clutches, brakes, band pulleys, etc, that can be readily replaced without the aid of special tools; and with this and minor objects in. View, my invention consists of the parts and combination of parts as will be more fully hereinafter set forth.

In the drawing, Figure l is a perspective View of a clutch ring with my invention in position; Fig. 2 is a top plan View of my invention detached; Fig. 3 is a sidc'elevation of the same; Fig. l is a sectional View show- -1ng my invention in position in the rim of.a

pulley; Fig. 5 is a perspective view of a brake-shoe embodying my invention; Fig. 6 is a perspective View of a pulley embodying my invention; and Figs. 7 and 8 are sectional views of slightly modified forms of the cup embodied in my invention.

1 represents acup having an annular flange 2 at the top thereof.

3 represents a piece of cork or any other suitable material for creating friction.

lVhile I have illustrated the cup as being provided with. the annular flange 2, it is, of course. obvious that this flange may be (main ted. Without affecting the elliciency of the cup.

The braking surface of the clutch, brakeshoe or pulley is prbvided with a series of holes, which may or may not extend entirely through the shoe, clutch orpulley, as preferred by the manufacturer.

In carrying out my invention, cork or other material designed to create friction is inserted in the cup 1 by suitable machinery and securely compressed therein against ac cidental displacement. The friction insert thus completed is furnished no the trade as an article of manufacture.

1 sin aware that cork inserts have heretofore been used, but in using the same it is necessary to drill a hole in the braking sur ,l'aceand by special machinery insert the cork in said holes under great pressure. The cork is first soaked before being inserted.

in this construction, it is absolutely necessary to send the part, Whether it be a brake shoe, clutch or pulley, to the factory or have special tools for the purpose of making the repair in the event of an accident to one of the cork inserts.

By my invention the inserts are manufactured and sold to the trade, and lllH-SillllCll as the cork is firmly cou'iprcssed in the cup, it is a simple matter for any one to insert the cupsin place \vilhout special tools or dillicultv. in the .:u;-.'c of an automobile, these cups may be inserted with case while on the road. i

In the use of my lI]\Q1lllOll,'tllHG is no limit. to the depth of the cork that may be used. nor is any special thickness of clutch ring required. 1

in the use of the cork inserts, which I have admitted to be l'u'rmdly old, it has been found that said inserts cannot be used Where the clutch ring is very thin; whereas, as above sluicd. the use oi my invention is not limilcd to any particular thickness of the clutch ring. inasmuch as the depth of the cup may be jusi as great when used With a thin clutch ring us-wluui used with a thick one. While the cups are firmly secured in the holes in the braking surface, it is, of course, understood that they are dctachably secured. The holes in the braking surface are provided with a shoulder 4, on which the annular fluugefl is seated.

in order that the air may escape from the cup while the cork is being driven in, I provide an opening or port 5 in lhe bottom thereof.

In the modified form of cup shown in Fig. 7. the cup is shown as provided with a bond (3 which is spun around the holder inwardly and adapted lo project into the cork thereby preventing the cork from being! accidculully displaced. I

l have shown the cup in Fig. 8 as being provided with a series of perforations? in the Walls thereof into which the cork is pressed while it is being compressed within the cup. The portions of the cork pressed iulo said perforations form a series of anchoring: lug-s or projections.

.l laving thus described my inventi0n,what

l claim as new anddcsirc to secure by Let face and to be held therein by friction; and

, to said surface; of a friction inse'rt comprismg a cylindrical holder with an annular flange at the top whereby said holder is adapted to be seated in said recess, and a i i friction inaterialfilling said holder.

cesse 3. The combination with a braking surface rovided with in series of annularly'red holes; of friction inserts constructed to be forced into said holes normally to the braking surface, each of said inserts comprising a flanged cup-shaped holder and cork secured in said holder.

4. The combination with a braking surface provided with aseries of cylindrical holes with shoulders therein near the months of said holes, of a c lindrical holder constructed to be force into said holes, an

annular flange at the top of the holder constructed to engage said shoulder to limit the inward movement of the holder, and cork axis of the insert to limlt the depth to which it may be introduced into a friction element, an inwardly rojecting annular head for retaining the ric'tion material therein, and a hole inthe closed end topermit the escape of air when 'the friction material is introduced.

1 i The foregoing specification signed at Newport Ky. this 16thday of October, 1907.

, FREDERICK C. MILLER. In presence of two witnesses A. M. LARKIN,

J. P. VVECKMAN.

3O wardly extending flange transverse to the I 

